Automatic stop for elevators.



W. THORSON. AUTOMATIC STOP FOR ELEVATORS.

APPLICATION FILED MAY 6, 1913.

Patented Jan. 13, 1914.

ammo o Villz'e Thorson wi lmemo COLUMBIA I'LANOGRAPH c0.. WASHINGTON. nC.

SIT S VILLIE THORSON, OF SPARTA, MICHIGAN.

AUTOMATIC STOP FOR ELEVATORS.

Specification of Letters Patent.

Patented. Jan. 13,1914.

Application filed May 6, 1913. Serial No. 765,952.

To all whom it may concern Be it known that I, YVILLIE THORSON, acitizen of the United States, residing at Sparta, in the county of Kentand State of Michigan, have invented new and useful Improvements inAutomatic Stops for Elevators, of which the following 1s aspecification.

This invention relates to improvements 1n safety stops for mine cages,passenger elevators and the like and has particular application to anautomatic stop whereby the cage or elevator will be brought to astandstill in the event of the hoist cable parting or break- In carryingout the present invention, 1t is my purpose to provide an automatic stopfor mine cages, passenger elevators and other analogous apparatus whichwill em- 20 body in its construction, among other teatures, dogspivotally mounted upon the top of the cage or elevator adjacent to theopposite sides thereof and capable of engaging rack bars secured to theopposite side walls of the well or shaft, such dogs being interconnectedthrough the medium of a leaf spring which acts normally to swing thedogs into active position, the hoistlng rope of the cage or car beingconnected with the dogs and holding the latter normally inactive againstthe action of the spring so that when the cable breaks the spring willreact and throw the dogs into engagement with the rack bars to bring thecar to an immediate stop.

It is also my purpose to provide an automatic stop for elevators whichWlll embrace the desired features of simplicity, efficiency, durabilityand strength and which may be installed and maintained at a minimumexiense.

VVith the above and other objects in view, the invention consists in theconstruction, combination and arrangement of parts hereinafter set forthin and falling within the scope of the claim.

In the accompanying drawing, Figure 1 is a vertical sectional viewthrough an elevator shaft showing a car therein equipped with anautomatic stop constructed in accordance with the present invention.Fig. 2 is a top plan view of the car.

Referring now to the accompanying drawing in detail, S designates anelevator shaft or well in which is mounted for sliding movement a cageor car C. Fixed in any appropriate manner to the opposite side walls ofthe Well S and preferably coextens'ive with the depth of the well arerack bars 1, 1, while appropriately fastened to the top of the car orcage 0 adjacent to the opposite sides thereof are bearing blocks 2, 2having the upper ends thereof forked or bifurcated as at 3 and equippedwith pivot pins 4 upon each of which is mounted for swinging,

posite end portions thereof bearing upon pins 9, 9 extending outwardlyfrom the sides of the dogs 5, 5. The numeral 10 designates the hoistcable or rope having the car end bifurcated and the terminals of suchbifurcated portion connected in some suitable manner to the inner endsof the dogs 5, 5.

From the foregoing description taken in connection with the accompanyingdrawing, the construction, mode of operation and manner of employing myimproved automatic stop for elevators will be readily apparent.Normally, the hoist cable 10 is taut and the inner ends of the dogs 5, 5held above the pivot pins 4, 4 against the tension of the leaf spring 8thereby holding the outer extremities of the dogs out of the plane ofthe rack bars. hen, however, the hoist cable breaks or parts, the spring8 reacts to swing the dogs 5 about their pivot pins and so throw theouter ends thereof into the plane of the rack bars 1, 1 to take thedescent of the cage or car. As the dogs are swung to an active positionunder the action of the spring 8 the inner ends thereof engage theabutment blocks 6, 6 and the latter take the weight of the cage as theouter ends of the dogs engage the teeth of the rack bars to hold thecage suspended Within the shaft or well.

I claim:

In an automatic stop for elevators, rack bars secured to opposite sidesof the elevator shaft, and a car carried mechanism comprising bearingblocks secured to the top of the car adjacent to the opposite sidesthereof, dogs pivoted between their ends within said blocks and havingthe outer ends therepiece secured to the top of the car between saiddogs, a leaf spring secured centrally to said bed piece, pins extendingoutwardly from the sides of said dogs and receiving 10 the ends of saidspring, and a hoist cable connected to the inner ends of said dogs andnormally holding the same inactive against the actlon of said sprlng.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIE THORSON.

WVitnesses:

' D. J. WALLACE,

MAT THoRsoN.

Gopies of this patent may be obtained for five cents each, byaddressingthe Commissioner of Patents, Washington, D. 0.

